Clean up. This dir is still on experimental branch
[sdlgit/SDL_perl.git] / test / OpenGL / tutorial / lesson02.pl
CommitLineData
8fde61e3 1#!/usr/bin/perl -w
2# This code was created by Jeff Molofee '99
3# (ported to SDL by Sam Lantinga '2000)
4# (ported to Perl/SDL by Wayne Keenan '2000)
5#
6# If you've found this code useful, please let me know.
7#
8# Visit me at www.demonews.com/hosted/nehe
9
10use strict;
11use Getopt::Long;
12
13use SDL;
14use SDL::App;
15use SDL::OpenGL;
16use SDL::Event;
17
18my $arg_screen_width =640;
19my $arg_screen_height=512;
20my $arg_fullscreen=0;
21
22GetOptions(
23 "width:i" => \$arg_screen_width,
24 "height:i" => \$arg_screen_height,
25 "fullscreen!" => \$arg_fullscreen,
26
27 ) or die $!;
28
29main();
30exit;
31
32
33sub main
34 {
35 my $done=0;
36
37 my $app = new SDL::App ( -title => "Jeff Molofee's GL Code Tutorial ... NeHe '99",
38 -icon => "icon.png",
39 -width => $arg_screen_width,
40 -height =>$arg_screen_height,
41 -d => 16,
42 -gl => 1,
43
44 );
45 $app->fullscreen() if ($arg_fullscreen);
46
47 SDL::ShowCursor (0);
48
49 my $event = new SDL::Event;
50 $event->set(SDL_SYSWMEVENT,SDL_IGNORE);#
51
52 InitGL($arg_screen_width, $arg_screen_height);
53
54 while ( ! $done ) {
55
56 DrawGLScene();
57
58 $app->sync();
59
60 $event->pump;
61 $event->poll;
62
63
64 if ( $event->type == SDL_QUIT ) {
65 $done = 1;
66 }
67
68 if ( $event->type == SDL_KEYDOWN ) {
69 if ( $event->key_sym == SDLK_ESCAPE ) {
70 $done = 1;
71 }
72 }
73 }
74 }
75
76
77
78
79
80
81#########################################################################
82#Pretty much in original form, but 'Perlised'
83
84
85sub InitGL
86 {
87 my ($Width, $Height)=@_;
88
89 glViewport(0, 0, $Width, $Height);
90 glClearColor(0.0, 0.0, 0.0, 0.0); # This Will Clear The Background Color To Black
91 glClearDepth(1.0); # Enables Clearing Of The Depth Buffer
92 glDepthFunc(GL_LESS()); # The Type Of Depth Test To Do
93 glEnable(GL_DEPTH_TEST()); # Enables Depth Testing
94 glShadeModel(GL_SMOOTH()); # Enables Smooth Color Shading
95
96 glMatrixMode(GL_PROJECTION());
97 glLoadIdentity(); # Reset The Projection Matrix
98
99 gluPerspective(45.0, $Width/$Height, 0.1, 100.0); # Calculate The Aspect Ratio Of The Window
100
101 glMatrixMode(GL_MODELVIEW());
102 }
103
104
105
106# The main drawing function.
107sub DrawGLScene
108 {
109 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); # Clear The Screen And The Depth Buffer
110 glLoadIdentity(); # Reset The View
111
112 glTranslate(-1.5,0.0,-6.0); # Move Left 1.5 Units And Into The Screen 6.0
113
114 # draw a triangle
115 glBegin(GL_POLYGON); # start drawing a polygon
116 glVertex( 0.0, 1.0, 0.0); # Top
117 glVertex( 1.0,-1.0, 0.0); # Bottom Right
118 glVertex(-1.0,-1.0, 0.0); # Bottom Left
119 glEnd(); # we're done with the polygon
120
121 glTranslate(3.0,0.0,0.0); # Move Right 3 Units
122
123 # draw a square (quadrilateral)
124 glBegin(GL_QUADS); # start drawing a polygon (4 sided)
125 glVertex(-1.0, 1.0, 0.0); # Top Left
126 glVertex( 1.0, 1.0, 0.0); # Top Right
127 glVertex( 1.0,-1.0, 0.0); # Bottom Right
128 glVertex(-1.0,-1.0, 0.0); # Bottom Left
129 glEnd(); # done with the polygon
130
131
132 }
133
134
135
136